<!--  -->
<template>
  <div>
    <el-switch v-model="draggable" active-text="开启拖拽" inactive-text="关闭拖拽"></el-switch>
    <el-button v-if="draggable" @click="batchSave">批量保存</el-button>
    <el-button type="danger" @click="batchDelete">批量删除</el-button>
    <el-tree :data="menus" :props="defaultProps" :expand-on-click-node="false" show-checkbox node-key="catId"
      :default-expanded-keys="expandedKey" :draggable="draggable" :allow-drop="allowDrop" @node-drop="handleDrop"
      ref="menuTree">
      <span class="custom-tree-node" slot-scope="{ node, data }">
        <span>{{ node.label }}</span>
        <span>
          <el-button v-if="node.level <= 2" type="text" size="mini" @click="() => append(data)">
            Append
          </el-button>

          <el-button type="text" size="mini" @click="edit(data)">
            修改
          </el-button>

          <el-button v-if="node.childNodes.length == 0" type="text" size="mini" @click="() => remove(node, data)">
            Delete
          </el-button>
        </span>
      </span>
    </el-tree>

    <!-- 对话框 -->
    <el-dialog :title="title" :visible.sync="dialogVisible" width="30%" :close-on-click-modal="false">
      <el-form :model="category">
        <el-form-item label="分类名称">
          <el-input v-model="category.name" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="图标">
          <el-input v-model="category.icon" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="计量单位">
          <el-input v-model="category.productUnit" autocomplete="off"></el-input>
        </el-form-item>
      </el-form>

      <span slot="footer" class="dialog-footer">
        <el-button @click="dialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="submitData">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      pCid: [],
      draggable: false,
      updateNodes: [],
      maxLevel: 0,
      category: {
        name: "",
        parentCid: 0,
        catLevel: 1,
        showStatus: 1,
        sort: 0,
        catId: null,
        icon: "",
        productUnit: "",
      },
      menus: [],
      expandedKey: [],
      dialogVisible: false,
      title: "",
      dalogType: "", //修改的时候是edit  添加是add
      defaultProps: {
        children: "children",
        label: "name",
      },
    };
  },

  components: {},

  //计算属性 类似data概念
  computed: {},

  mounted: {},

  //方法集合
  methods: {
    allowDrop(draggingNode, dropNode, type) {
      //判断被拖动的当前节点以及所在的父节点总层数不能大于3

      //判断被拖动的当前节点总层数
      console.log("allowDrop:", draggingNode, dropNode, type);
      //
      this.countNodeLevel(draggingNode);

      let deep = Math.abs(this.maxLevel - draggingNode.level) + 1;
      console.log("深度:", deep);
      if (type == "inner") {
        return deep + dropNode.level <= 3;
      } else {
        return deep + dropNode.parent.level <= 3;
      }
    },
    batchDelete() {
      let catIds = [];
      let checkNodes = this.$refs.menuTree.getCheckedNodes();
      console.log("被选中的元素:", checkNodes);
      for (let i = 0; i < checkNodes.length; i++) {
        catIds.push(checkNodes[i].catId);
      }
      this.$confirm(`是否批量删除【${catIds}】菜单`, "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning",
      })
        .then(() => {
          this.$http({
            url: this.$http.adornUrl("/product/category/delete"),
            method: "post",
            data: this.$http.adornData(catIds, false),
          }).then(({ data }) => {
            this.$message({
              message: "菜单批量删除成功",
              type: "success",
            });
            //刷新菜单
            this.getMenus();
          });
        })
        .catch(() => {});
    },
    batchSave() {
      //批量保存方法
      this.$http({
        url: this.$http.adornUrl("/product/category/update/sort"),
        method: "post",
        data: this.$http.adornData(this.updateNodes, false),
      }).then(({ data }) => {
        this.$message({
          message: "菜单顺序等成功",
          type: "success",
        });
        //刷新菜单
        this.getMenus();
        //设置默认展开菜单
        this.expandedKey = this.pCid;
        //初始化数据
        this.updateNodes = [];
        this.maxLevel = 0;
        // this.pCid = 0;
      });
    },
    handleDrop(draggingNode, dropNode, dropType, ev) {
      console.log("handleDrop: ", draggingNode, dropNode, dropType);
      //获取当前节点最新的父节点id
      let pCid = 0;
      let siblings = null;
      //拖拽方式是进入直接获取当前父节点id 否则取层级id
      if (dropType == "inner") {
        pCid = dropNode.data.catId;
        siblings = dropNode.childNodes;
      } else {
        pCid =
          dropNode.parent.data.catId == undefined
            ? 0
            : dropNode.parent.data.catId;
        siblings = dropNode.parent.childNodes;
      }
      this.pCid.push(pCid);
      //当前拖拽节点的最新顺序
      for (let i = 0; i < siblings.length; i++) {
        //如果遍历的是当前正在拖拽的节点
        if (siblings[i].data.catId == draggingNode.data.catId) {
          let catLevel = draggingNode.level;
          //当前节点层级发生变化
          if (siblings[i].level != draggingNode.level) {
            //当前节点的层级发生变化
            catLevel = siblings[i].level;
            //修改当前子节点的层级
            this.updateChildNodeLevel(siblings[i]);
          }
          this.updateNodes.push({
            catId: siblings[i].data.catId,
            sort: i,
            parentCid: pCid,
            catLevel: catLevel,
          });
        } else {
          this.updateNodes.push({ catId: siblings[i].data.catId, sort: i });
        }
      }
      //当前拖拽节点的最新层级
      console.log("updateNodes", this.updateNodes);
    },
    updateChildNodeLevel(node) {
      if (node.childNodes.length > 0) {
        for (let i = 0; i < node.childNodes.length; i++) {
          var cNode = node.childNodes[i].data;
          this.updateNodes.push({
            catId: cNode.catId,
            catLevel: node.childNodes[i].level,
          });
          this.updateChildNodeLevel(node.childNodes[i]);
        }
      }
    },
    countNodeLevel(node) {
      //找到所有子节点，计算出最大深度
      if (node.childNodes != null && node.childNodes.length > 0) {
        //或许每一个子节点的最大层级，找到最大深度maxLevel
        for (let i = 0; i < node.childNodes.length; i++) {
          if (node.childNodes[i].level > this.maxLevel) {
            this.maxLevel = node.childNodes[i].level;
          }
          //递归获取最大深度
          this.countNodeLevel(node.childNodes[i]);
        }
      }
    },
    handleNodeClick(data) {
      console.log(data);
    },
    getMenus() {
      this.$http({
        url: this.$http.adornUrl("/product/category/list/tree"),
        method: "get",
      }).then(({ data }) => {
        console.log("成功获取到菜单数据", data.data);
        this.menus = data.data;
      });
    },
    edit(data) {
      console.log("修改数据信息", data);
      this.dalogType = "edit";
      (this.title = "修改分类"), (this.dialogVisible = true);

      //发送请求获取当前节点最新的数据
      this.$http({
        url: this.$http.adornUrl(`/product/category/info/${data.catId}`),
        method: "get",
      }).then(({ data }) => {
        //请求成功后
        console.log("回显的数据", data);
        this.category.name = data.data.name;
        this.category.catId = data.data.catId;
        this.category.icon = data.data.icon;
        this.category.parentCid = data.data.parentCid;
      });
    },
    append(data) {
      this.dialogVisible = true;
      this.dalogType = "add";
      this.title = "添加分类";
      console.log("append", data);
      this.category.parentCid = data.catId;
      this.category.catLevel = data.catLevel * 1 + 1;
      this.category.name = "";
      this.category.catId = null;
      this.category.icon = "";
      this.category.productUnit = "";
      this.category.sort = 0;
      this.category.showStatus = 1;
    },
    //添加三级分类的方法
    addCategory() {
      console.log("提交的三级分类数据", this.category);
      this.$http({
        url: this.$http.adornUrl("/product/category/save"),
        method: "post",
        data: this.$http.adornData(this.category, false),
      }).then(({ data }) => {
        this.$message({
          message: "菜单保存成功",
          type: "success",
        });
        //关闭提交框
        this.dialogVisible = false;
        //刷新菜单
        this.getMenus();
        //设置默认展开菜单
        this.expandedKey = [this.category.parentCid];
      });
    },
    //修改三级分类的方法
    editCategory() {
      // console.log("提交的三级分类数据", this.edit);
      //解构数据
      var { name, catId, icon, productUnit } = this.category;
      this.$http({
        url: this.$http.adornUrl("/product/category/update"),
        method: "post",
        data: this.$http.adornData({ name, catId, icon, productUnit }, false),
      }).then((data) => {
        this.$message({
          message: "菜单修改成功",
          type: "success",
        });
        //关闭提交框
        this.dialogVisible = false;
        this.getMenus();
        //设置默认展开菜单
        this.expandedKey = [this.category.parentCid];
      });
    },
    remove(node, data) {
      var ids = [data.catId];
      this.$confirm(`是否删除【${data.name}】菜单`, "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning",
      })
        .then(() => {
          this.$http({
            url: this.$http.adornUrl("/product/category/delete"),
            method: "post",
            data: this.$http.adornData(ids, false),
          }).then(({ data }) => {
            console.log("删除成功...");
            this.$message({
              message: "菜单删除成功",
              type: "success",
            });
            //删除成功后 刷新页面菜单数据 请求菜单接口刷新
            this.getMenus();
            //设置默认展开菜单
            this.expandedKey = [node.parent.data.catId];
          });
        })
        .catch(() => {});

      console.log("remove", node, data);
    },
    submitData() {
      if (this.dalogType == "add") {
        //如果是点击添加 调用添加的方法
        this.addCategory();
      } else {
        //否则是修改的方法
        this.editCategory();
      }
    },
  },
  //生命周期 - 创建完成
  created() {
    this.getMenus();
  },
};
</script>
<style lang='scss' scoped>
</style>